lx1689 Microsemi Corporation, lx1689 Datasheet - Page 9

• Manufacturer Part Number: lx1689
• Description: Third Generation Ccfl Controller
• Manufacturer: Microsemi Corporation

Copyright © 2000
Rev. 1.1, 2006-02-27
Alternate Maximum Lamp Current Table
Lamp current | R1 value |
4.0mArms | 6.65K 1%
3.5mArms | 6.65K 1%
3.0mArms | 6.65K 1%
2.5mArms | 11.8K 1%
2.0mArms | 11.8K 1%
1.5mArms | 11.8K 1%
Burst Rate Freq: 195Hz ± 4%
Min. Brite Pos Duty <= 1.6%
PWM freq 7.5Khz to 100Khz
Max. Brite Pos Duty >= 92%
BRITE Input Control Range
(2.5V to 3.3V Logic PWM)
Min. Brite 'LO' <= 0.50V
Max. Brite 'HI' >= 2.00V
TM
* Conventional polarity means that the lamp brightness increases with increasing voltage on the BRITE_IN pin.
Reverse polarity means that brightness decreases with increasing voltage.
(Linear DC)
Floating or VDD_A/2
Floating or VDD_A/2
ENABLE
DIM_MODE
BRITE
V
GND
| 221 1%
| 255 1%
| 294 1%
| 200 1%
| 249 1%
| 332 1%
VDD_A
BATT
R7 Value
GND
GND
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
OFF: Logic 'LOW' =< 0.8V
Logic Level: 2.5V to 3.3V
ON: Logic 'HI' = >1.5V
Enable input
VDD_A
C1
100nF 16V
N.C.
External Clock Source
6.65
100nF 16V
F
R1
K 1%
IGURE
DIM_CLK
VDD_A
VDD_A
3.0V < V
T Y P I C A L A P P L I C A T I O N
Nominal 3.2V to 4.2V
C2
GND
GND
AOUT
BOUT
DIM_CLK
DIM_MODE
BRITE_R
BRITE_IN
GND
DIV_248
BRITE_C
ENABLE
2 – LX1689 Typical 1W Application
D I M M I N G T A B L E
100nF 16V
Integrated Products
BATT
®
LX1689CPW
Microsemi
C3
< 5V
100nF 16V
BRITE_OUT
C4
OC_SNS
EA_OUT
OV_SNS
VDD_P
VDD_A
EA_IN
I_SNS
Dimming from Divided
Dimming from divided
Dimming from divided
V
BATT
I_R
DIMMING MODE
Analog Dimming
Analog Dimming
DIM_CLK input
Run Frequency
Run Frequency
External Burst
Internal Burst
Internal Burst
Third Generation CCFL Controller
VDD_A
C5
470pF 16V
51.1K
10K
P
R4
R2
1%
RODUCTION
C11
1.0uF 10V
10%
R5
10
U2 FDC6305N
FAIRCHILD
1
3
R3
4.99K 1%
DIMMING POLARITY*
6
D
2,5
4
ATA
*C9 PCB C
APPROXIMATELY
PCB CAP
A
Conventional
Conventional
Conventional
16V
1nF
C7
REA
Reverse
Reverse
(
MM
+
T1 SGE2697-1
MICROSEMI
1
2
3
10V 20%
S
LMT1410
²) = D(mm) x C x 113097 E
100µF
TANT
1:53
C6
AREA FORMULA
HEET
APACITOR COPPER AREAS TO EQUAL
120
R6
34
4,5
2
6
MM FOR
25V 5%
100nF
1.5nF
COG
50V
C10
C8
C9*
2pF
(K
0.80
TYPICIALLY
MM THICK
LX1689
+9
/ K
= 5.35)
275V
I
100kHz
R7
255Ω 1%
PCB
OUT
Page 9
= 3.5m
RMS
Lamp
Lamp
±